| // Copyright 2014 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| #![feature(core_intrinsics)] |
| |
| use std::intrinsics::assume; |
| |
| unsafe fn f(x: i32) -> i32 { |
| assume(x == 34); |
| match x { |
| 34 => 42, |
| _ => 30 |
| } |
| } |
| |
| fn main() { |
| let x = unsafe { f(34) }; |
| assert_eq!(x, 42); |
| } |
